/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.lazy.lib.net.tcp.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelId;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.lazy.lib.net.common.INetContext;

/**
 * Simplistic telnet client.
 */
public final class TcpClient {
    private static final Logger logger = LoggerFactory.getLogger(TcpClient.class);
    private static Map<ChannelId, Channel> mapChannels = new ConcurrentHashMap<ChannelId, Channel>();
    
    private int port;
    private String host;
    
    EventLoopGroup group;
    Bootstrap bootstrap;

    private INetContext netContext;
    
    public TcpClient(String host, int port){
        this.host = host;
        this.port = port;
    }
    
    public void init() {
        group = new NioEventLoopGroup();
            bootstrap = new Bootstrap();
            bootstrap.group(group)
             .channel(NioSocketChannel.class)
             .handler(new TcpClientInitializer(netContext));
    }
    
    public void setLocalHost(String localHost) {
        bootstrap.localAddress(localHost, 0);
    }
    
    public ChannelFuture connect() {
        // Start the connection attempt.
        if (bootstrap != null) {
            try{
                ChannelFuture future = bootstrap.connect(host, port).sync();
                mapChannels.put(future.channel().id(), future.channel());
                logger.info("Connected to {} ", future.channel());
//                ChannelFuture future = bootstrap.connect(host, port).addListener(new ChannelFutureListener() {
//                    @Override
//                    public void operationComplete(ChannelFuture future) throws Exception{
//                        logger.info("Connected to {} ", future.channel());
//                    }
//                    
//                });
                
                return future;
            }catch(Exception e){
                e.printStackTrace();
            }
        }
        return null;
    }
    
    /**
     * 返回channels
     * @return
     */
    public static Map<ChannelId, Channel> getMapChannels(){
        return mapChannels;
    }
    
    public void stop() {
        if (group != null) {
            group.shutdownGracefully();
        }
    }
    
    public void setNetContext(INetContext netContext){
        this.netContext = netContext;
    }
    
    public INetContext getNetContext(){
        return netContext;
    }
}
